/**
 * jQuery lightBox plugin
 * This jQuery plugin was inspired and based on Lightbox 2 by Lokesh Dhakar (http://www.huddletogether.com/projects/lightbox2/)
 * and adapted to me for use like a plugin from jQuery.
 * @name jquery-lightbox-0.5.js
 * @author Leandro Vieira Pinho - http://leandrovieira.com
 * @version 0.5
 * @date April 11, 2008
 * @category jQuery plugin
 * @copyright (c) 2008 Leandro Vieira Pinho (leandrovieira.com)
 * @license CC Attribution-No Derivative Works 2.5 Brazil - http://creativecommons.org/licenses/by-nd/2.5/br/deed.en_US
 * @example Visit http://leandrovieira.com/projects/jquery/lightbox/ for more informations about this jQuery plugin
 */
(function ($) {
    $.fn.lightBox = function (settings) {
        settings = jQuery.extend({overlayBgColor:'#000', overlayOpacity:0.8, fixedNavigation:false, imageLoading:'images/lightbox-ico-loading.gif', imageBtnPrev:'images/lightbox-btn-prev.gif', imageBtnNext:'images/lightbox-btn-next.gif', imageBtnClose:'images/lightbox-btn-close.gif', imageBlank:'images/lightbox-blank.gif', containerBorderSize:10, containerResizeSpeed:400, txtImage:'图片', txtOf:'/', keyToClose:'c', keyToPrev:'p', keyToNext:'n', imageArray:[], activeImage:0}, settings);
        var jQueryMatchedObj = this;

        function _initialize() {
            _start(this, jQueryMatchedObj);
            return false;
        }

        function _start(objClicked, jQueryMatchedObj) {
            $('embed, object, select').css({'visibility':'hidden'});
            _set_interface();
            settings.imageArray.length = 0;
            settings.activeImage = 0;
            if (jQueryMatchedObj.length == 1) {
                settings.imageArray.push(new Array(objClicked.getAttribute('href'), objClicked.getAttribute('title')));
            } else {
                for (var i = 0; i < jQueryMatchedObj.length; i++) {
                    settings.imageArray.push(new Array(jQueryMatchedObj[i].getAttribute('href'), jQueryMatchedObj[i].getAttribute('title')));
                }
            }
            while (settings.imageArray[settings.activeImage][0] != objClicked.getAttribute('href')) {
                settings.activeImage++;
            }
            _set_image_to_view();
        }

        function _set_interface() {
            $('body').append('<div id="jquery-overlay"></div><div id="jquery-lightbox"><div id="lightbox-container-image-box"><div id="lightbox-container-image"><img id="lightbox-image"><div style="" id="lightbox-nav"><a href="#" id="lightbox-nav-btnPrev"></a><a href="#" id="lightbox-nav-btnNext"></a></div><div id="lightbox-loading"><a href="#" id="lightbox-loading-link"><img src="' + settings.imageLoading + '"></a></div></div></div><div id="lightbox-container-image-data-box"><div id="lightbox-container-image-data"><div id="lightbox-image-details"><span id="lightbox-image-details-caption"></span><span id="lightbox-image-details-currentNumber"></span></div><div id="lightbox-secNav"><a href="#" id="lightbox-secNav-btnClose"><img src="' + settings.imageBtnClose + '"></a></div></div></div></div>');
            var arrPageSizes = ___getPageSize();
            $('#jquery-overlay').css({backgroundColor:settings.overlayBgColor, opacity:settings.overlayOpacity, width:arrPageSizes[0], height:arrPageSizes[1]}).fadeIn();
            var arrPageScroll = ___getPageScroll();
            $('#jquery-lightbox').css({top:arrPageScroll[1] + (arrPageSizes[3] / 10), left:arrPageScroll[0]}).show();
            $('#jquery-overlay,#jquery-lightbox').click(function () {
                _finish();
            });
            $('#lightbox-loading-link,#lightbox-secNav-btnClose').click(function () {
                _finish();
                return false;
            });
            $(window).resize(function () {
                var arrPageSizes = ___getPageSize();
                $('#jquery-overlay').css({width:arrPageSizes[0], height:arrPageSizes[1]});
                var arrPageScroll = ___getPageScroll();
                $('#jquery-lightbox').css({top:arrPageScroll[1] + (arrPageSizes[3] / 10), left:arrPageScroll[0]});
            });
        }

        function _set_image_to_view() {
            $('#lightbox-loading').show();
            if (settings.fixedNavigation) {
                $('#lightbox-image,#lightbox-container-image-data-box,#lightbox-image-details-currentNumber').hide();
            } else {
                $('#lightbox-image,#lightbox-nav,#lightbox-nav-btnPrev,#lightbox-nav-btnNext,#lightbox-container-image-data-box,#lightbox-image-details-currentNumber').hide();
            }
            $('<img />').load(function() {
                var pageSize = ___getPageSize(),
                    width = Math.min(pageSize[2] - 50, this.width),
                    height = Math.min(pageSize[3] - 150, this.height);
                $('#lightbox-image')
                    .attr('src', this.src)
                    .css({
                        'max-width': width,
                        'max-height': height
                    });
                setTimeout(function() {
                    _resize_container_image_box($('#lightbox-image').width(), $('#lightbox-image').height());
                }, 50);
                $(this).remove();
            }).attr('src', settings.imageArray[settings.activeImage][0]);
        }

        function _resize_container_image_box(intImageWidth, intImageHeight) {
            var intCurrentWidth = $('#lightbox-container-image-box').width();
            var intCurrentHeight = $('#lightbox-container-image-box').height();
            var intWidth = (intImageWidth + (settings.containerBorderSize * 2));
            var intHeight = (intImageHeight + (settings.containerBorderSize * 2));
            var intDiffW = intCurrentWidth - intWidth;
            var intDiffH = intCurrentHeight - intHeight;
            $('#lightbox-container-image-box').animate({width:intWidth, height:intHeight}, settings.containerResizeSpeed, function () {
                _show_image();
            });
            if ((intDiffW == 0) && (intDiffH == 0)) {
                if ($.browser.msie) {
                    ___pause(250);
                } else {
                    ___pause(100);
                }
            }
            $('#lightbox-container-image-data-box').css({width:intImageWidth});
            $('#lightbox-nav-btnPrev,#lightbox-nav-btnNext').css({height:intImageHeight + (settings.containerBorderSize * 2)});
        }

        function _show_image() {
            $('#lightbox-loading').hide();
            $('#lightbox-image').fadeIn(function () {
                _show_image_data();
                _set_navigation();
            });
            _preload_neighbor_images();
        }

        function _show_image_data() {
            $('#lightbox-container-image-data-box').slideDown('fast');
            $('#lightbox-image-details-caption').hide();
            if (settings.imageArray[settings.activeImage][1]) {
                $('#lightbox-image-details-caption').html(settings.imageArray[settings.activeImage][1]).show();
            }
            if (settings.imageArray.length > 1) {
                $('#lightbox-image-details-currentNumber').html(settings.txtImage + ' ' + (settings.activeImage + 1) + ' ' + settings.txtOf + ' ' + settings.imageArray.length).show();
            }
        }

        function _set_navigation() {
            $('#lightbox-nav').show();
            $('#lightbox-nav-btnPrev,#lightbox-nav-btnNext').css({'background':'transparent url(' + settings.imageBlank + ') no-repeat'});
            if (settings.activeImage != 0) {
                if (settings.fixedNavigation) {
                    $('#lightbox-nav-btnPrev').css({'background':'url(' + settings.imageBtnPrev + ') left 15% no-repeat'}).unbind().bind('click', function () {
                        settings.activeImage = settings.activeImage - 1;
                        _set_image_to_view();
                        return false;
                    });
                } else {
                    $('#lightbox-nav-btnPrev').unbind().hover(
                        function () {
                            $(this).css({'background':'url(' + settings.imageBtnPrev + ') left 15% no-repeat'});
                        },
                        function () {
                            $(this).css({'background':'transparent url(' + settings.imageBlank + ') no-repeat'});
                        }).show().bind('click', function () {
                        settings.activeImage = settings.activeImage - 1;
                        _set_image_to_view();
                        return false;
                    });
                }
            }
            if (settings.activeImage != (settings.imageArray.length - 1)) {
                if (settings.fixedNavigation) {
                    $('#lightbox-nav-btnNext').css({'background':'url(' + settings.imageBtnNext + ') right 15% no-repeat'}).unbind().bind('click', function () {
                        settings.activeImage = settings.activeImage + 1;
                        _set_image_to_view();
                        return false;
                    });
                } else {
                    $('#lightbox-nav-btnNext').unbind().hover(
                        function () {
                            $(this).css({'background':'url(' + settings.imageBtnNext + ') right 15% no-repeat'});
                        },
                        function () {
                            $(this).css({'background':'transparent url(' + settings.imageBlank + ') no-repeat'});
                        }).show().bind('click', function () {
                        settings.activeImage = settings.activeImage + 1;
                        _set_image_to_view();
                        return false;
                    });
                }
            }
            _enable_keyboard_navigation();
        }

        function _enable_keyboard_navigation() {
            $(document).keydown(function (objEvent) {
                _keyboard_action(objEvent);
            });
        }

        function _disable_keyboard_navigation() {
            $(document).unbind();
        }

        function _keyboard_action(objEvent) {
            if (objEvent == null) {
                keycode = event.keyCode;
                escapeKey = 27;
            } else {
                keycode = objEvent.keyCode;
                escapeKey = objEvent.DOM_VK_ESCAPE;
            }
            key = String.fromCharCode(keycode).toLowerCase();
            if ((key == settings.keyToClose) || (key == 'x') || (keycode == escapeKey)) {
                _finish();
            }
            if ((key == settings.keyToPrev) || (keycode == 37)) {
                if (settings.activeImage != 0) {
                    settings.activeImage = settings.activeImage - 1;
                    _set_image_to_view();
                    _disable_keyboard_navigation();
                }
            }
            if ((key == settings.keyToNext) || (keycode == 39)) {
                if (settings.activeImage != (settings.imageArray.length - 1)) {
                    settings.activeImage = settings.activeImage + 1;
                    _set_image_to_view();
                    _disable_keyboard_navigation();
                }
            }
        }

        function _preload_neighbor_images() {
            if ((settings.imageArray.length - 1) > settings.activeImage) {
                objNext = new Image();
                objNext.src = settings.imageArray[settings.activeImage + 1][0];
            }
            if (settings.activeImage > 0) {
                objPrev = new Image();
                objPrev.src = settings.imageArray[settings.activeImage - 1][0];
            }
        }

        function _finish() {
            $('#jquery-lightbox').remove();
            $('#jquery-overlay').fadeOut(function () {
                $('#jquery-overlay').remove();
            });
            $('embed, object, select').css({'visibility':'visible'});
        }

        function ___getPageSize() {
            var xScroll, yScroll;
            if (window.innerHeight && window.scrollMaxY) {
                xScroll = window.innerWidth + window.scrollMaxX;
                yScroll = window.innerHeight + window.scrollMaxY;
            } else if (document.body.scrollHeight > document.body.offsetHeight) {
                xScroll = document.body.scrollWidth;
                yScroll = document.body.scrollHeight;
            } else {
                xScroll = document.body.offsetWidth;
                yScroll = document.body.offsetHeight;
            }
            var windowWidth, windowHeight;
            if (self.innerHeight) {
                if (document.documentElement.clientWidth) {
                    windowWidth = document.documentElement.clientWidth;
                } else {
                    windowWidth = self.innerWidth;
                }
                windowHeight = self.innerHeight;
            } else if (document.documentElement && document.documentElement.clientHeight) {
                windowWidth = document.documentElement.clientWidth;
                windowHeight = document.documentElement.clientHeight;
            } else if (document.body) {
                windowWidth = document.body.clientWidth;
                windowHeight = document.body.clientHeight;
            }
            if (yScroll < windowHeight) {
                pageHeight = windowHeight;
            } else {
                pageHeight = yScroll;
            }
            if (xScroll < windowWidth) {
                pageWidth = xScroll;
            } else {
                pageWidth = windowWidth;
            }
            arrayPageSize = new Array(pageWidth, pageHeight, windowWidth, windowHeight);
            return arrayPageSize;
        }

        function ___getPageScroll() {
            var xScroll, yScroll;
            if (self.pageYOffset) {
                yScroll = self.pageYOffset;
                xScroll = self.pageXOffset;
            } else if (document.documentElement && document.documentElement.scrollTop) {
                yScroll = document.documentElement.scrollTop;
                xScroll = document.documentElement.scrollLeft;
            } else if (document.body) {
                yScroll = document.body.scrollTop;
                xScroll = document.body.scrollLeft;
            }
            arrayPageScroll = new Array(xScroll, yScroll);
            return arrayPageScroll;
        }

        function ___pause(ms) {
            var date = new Date();
            curDate = null;
            do {
                var curDate = new Date();
            }
            while (curDate - date < ms);
        }

        return this.unbind('click').click(_initialize);
    };
})(jQuery);